7477 datasheet(38/48 Pages) RENESAS

38 / 48 page

MITSUBISHI MICROCOMPUTERS

7477/ 7478 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Table 2. Pin function in EPROM mode

M37477E8, M37478E8

VCC

P33

VSS

Ports

P11 – P17,

P20 – P23, P30,

P31, P40, P41

Port P0

VREF

P32

VCC

VPP

VSS

Address input

Data I/O

M5L27C256K

VCC

VPP

VSS

A0 – A14

D0 – D7

Fig. 30 Pin connection in EPROM mode

A10

VSS

A14

A13

VPP

A12

A11

VCC

VSS

P17/SRDY

P16/SCLK

P15/TXD

P14/RXD

P13/T1

P12/T0

P11

P10

P23/IN3

P22/IN2

P21/IN1

P20/IN0

VREF

XIN

XOUT

VSS

P07

P06

P05

P04

P03

P02

P01

P00

P41

P40

P33/CNTR1

P32/CNTR0

P31/INT1

P30/INT0

RESET

VCC

P53

P27/IN7

P26/IN6

P25/IN5

P24/IN4

P52

P51/XCOUT

P50/XCIN

P43

P42

Oscillation

circuit

: Same functions as M5L27C256K

EPROM MODE

The M37477E8, M37478E8 feature an EPROM mode in addition

to its normal modes. When the RESET signal level is low (“L”), the

chip automatically enters the EPROM mode. Table 2 lists the cor-

respondence between pins and Figure 30 to 32 give the pin

connection in the EPROM mode. When in the EPROM mode,

ports P0, P11 to P17, P20 to P23, P3, P40, P41 and VREF are used

for the PROM (equivalent to the M5L27C256K). When in this

mode, the built-in PROM can be written to or read from using

these pins in the same way as with the M5L27C256K. The oscilla-

tor should be connected to the XIN and XOUT pins, or external

clock should be connected to the XIN pin.

7477 Datasheet(PDF) 38 Page - Renesas Technology Corp

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